Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
Question
Question I
(a) List and briefly explain the four components of the discipline of materials
science and engineering in a linear relationship.
(b) Using a flowchart, classify engineering materials, indicating the types of
polymers.
141
(e) Determine the Miller indices for the directions in the cubic unit cell shown
below (Fig. Q1):
181
B
D
A
y
Fig. QI
(d) BCC lithium has a lattice parameter of 3.5089 x 10-10 m and contains one
vacancy per 200-unit cells. If the atomic weight of lithium is 207.19 g/mol and
Avogadro's number is 6.02 x 102, Calculate:
Question 2
(i)
the number of vacancies per cubic metre and
(ii)
the density of lithium.
(a) For a HCP crystal structure, show that the ideal c/a ratio is 1.633
[8]
[3]
[4]
(b) Rhenium has an HCP structure, an atomic radius of 0.137 nm, and a c/a ratio of
1.615. Find the volume of the unit cell for Rhenium, if the base area of an HCP
crystal structure is 6R²√3
[7]
(c) The weights of the individual constituents of an alloy are 45,224 g of copper,
46,267 g of zinc and 953 g of lead. Find the composition, in atomic percent, of the
alloy, if the alloy contains no other alloying elements. [Atomic weight of copper =
63.55 g/mol; atomic weight of zinc 65.41 g/mol; atomic weight of lead = 207.2
g/mol; Avogadro's number 6.023 x 1023 atoms/mol].
[5]
(d) A cylindrical rod of copper having a yield strength of 240 MPa is to be
subjected to a load of 6660 N. If the length of the rod is 380 mm, find the
necessary diameter to allow an elongation of 0.5 mm. [E 110 GPa].
[5]
Question 3
3
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Transcribed Image Text:Question I (a) List and briefly explain the four components of the discipline of materials science and engineering in a linear relationship. (b) Using a flowchart, classify engineering materials, indicating the types of polymers. 141 (e) Determine the Miller indices for the directions in the cubic unit cell shown below (Fig. Q1): 181 B D A y Fig. QI (d) BCC lithium has a lattice parameter of 3.5089 x 10-10 m and contains one vacancy per 200-unit cells. If the atomic weight of lithium is 207.19 g/mol and Avogadro's number is 6.02 x 102, Calculate: Question 2 (i) the number of vacancies per cubic metre and (ii) the density of lithium. (a) For a HCP crystal structure, show that the ideal c/a ratio is 1.633 [8] [3] [4] (b) Rhenium has an HCP structure, an atomic radius of 0.137 nm, and a c/a ratio of 1.615. Find the volume of the unit cell for Rhenium, if the base area of an HCP crystal structure is 6R²√3 [7] (c) The weights of the individual constituents of an alloy are 45,224 g of copper, 46,267 g of zinc and 953 g of lead. Find the composition, in atomic percent, of the alloy, if the alloy contains no other alloying elements. [Atomic weight of copper = 63.55 g/mol; atomic weight of zinc 65.41 g/mol; atomic weight of lead = 207.2 g/mol; Avogadro's number 6.023 x 1023 atoms/mol]. [5] (d) A cylindrical rod of copper having a yield strength of 240 MPa is to be subjected to a load of 6660 N. If the length of the rod is 380 mm, find the necessary diameter to allow an elongation of 0.5 mm. [E 110 GPa]. [5] Question 3 3
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